Dipper tooth



Nov. 20, 1928.

' G. R. HANKS DIFFER TOOTH Fliled March 25. 1926 Patentedi Nov. 20, 1928.

GEORGE R. HANKS, O1 HIGH BRIDGE, NEW JERSEY,

IRON .AND STEEL COMPANY, 0F HIGH BRIDGE,

NEW JERSEY.

ASSIGNOR- TO TAYLOR-WHARTON NEW JERSEY, A CORPORATION OF 'DIPPEB Toorn.

Application led March 25, 1926. Serial No 97,270.

My invention relates more particularl to dipper teeth of the type embodying a ase and a detachable point. For many years it has been standard Apractice to bifurcate the nose of the base to provide for reversible application of the point. This practice, in the main, has been eminently satisfactory, but under severe digging strain, developing considerable side thrust, there have been instances of serious spreading and breakage of the jaws of the base. It has been heretofore proposed to eliminate the slot by'providing the point with a pocket to envelop the nose of the base. That proposal is inherently faulty for the reason that metal is massed in the nose of the base to such an extent as to hamper the production of uniformly sound castings and to make it impossible or in any event exceedingly diiiicult to properly heat treat. The proposal suffers the further disadvantage of lack of proper means for tightening the point and under the circumstance of stretching of the relatively thin walls of the pocket this is a serious drawback and hastens the destruction of the point. It is a fact, however, that rid of the 'defects mentioned the box-section design will rate better than the standard two-part tooth in competitive service. And it is the purpose of my invention to overcome those defects.

In achieving that purpose I have strengthened the base by a novel uniform distribution of the metal and in providing for interchangeability of point and base I have devised an eflicient lock and have overcomethe tendency of angular movement or rotation of the point. I

The invention in its preferred embodiment is illustrated in the accompanying drawings, wherein Figure l is a plan view ofthe complete assembly;

Fig. 2 is a side elevational view of the same Fig. 3 is a section of the bottomlug looking in the direction of the arrow 3, Fig. 2;

Fig. 4 is a sectionon line 4 4, Fig. 2;

Fig. 5 is a section on line 5 5-, Fig. 4;

Fig. 6 is a. section on line 6 6, Fig. 2; and

Fig. 7 is a section on line 7 7, Fig. 2.

. -In the drawings,

10 represents the base and 20 represents the point. The nose of the base has a central longitudinally ranging socket that is cruciform in cross section. the d iametrically disposed depressions 11 giving. rise to that shape. The shank 12 of the point has ribs 13 which mate with the longitudinal ways or depressions 11. There is thus established a spline connection which precludes angular or rotary movement of the point. The base is-provided with a cored opening 14 and the shank of the point has a hollow boss or eye 15 for cooperation with an appropriate tightening device to cause Athe shoulder 16 of the point to fit flush with the rim of the socket. l

The socket provides for substantial uniformity of metal section. Further provision of this kind is afforded by the cored area or cavity 17, and by the channel sec-tion 18 of the bottom lug. And in the main body of the base and between the rivet holesI corel out the metal variously as indicated at 19 and 21. The effect of this is substantial uniformity of metal section throughout the base and the establishment of substantially tubular rivet-receiving pockets 22. In further extension of the metal-reducing thought it will be observed that the entries 23 are directed laterally or at right angles to the direction of' the rivet openings or pockets 22.

Having described my invention, I claim:

1. A solid basehaving rivet openings and intervening metal@ reducing cavities whereof the entries are at right angles to the rivet openings, whereby provision is made for uniform heat treatment Without weakening the structure of the base.

2. A base having a socket in part of cruciform and in part of other and reduced section, in combination with a point capable of reversible application thereto and whereof the construction and arrangement are such that a spline connection is established the ei'ective length of the cruciform section to secure the point against angular or rotative movement with relation to the base, said point having a shank adapted to fit the reduced section, and a lock for the shank;

3. A dpper tooth adapted for uniformity ment Without weakening the structure, uniof heat treatment and hence long life and of formity of metal section beingl continued by the box section base and point assembly type, a point-seating socket of box section, anda 1o comprising, in combination, a solid base 'of point having a spline fit in said socket to 5 the underlug type having rivet openings and overcome tendency to angular movement.

intervening metal reducing cavities to pro- In testimony whereof I affix my signature.V vide substantially for uniform heat treat- GEORGE R. BANKS. 

